{"product_id":"motorola-mpx200-replacement-battery-37v-750mah-li-ion","title":"SNN5681 Motorola MPX200 Replacement Battery 3.7V 750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola MPX200 — 3.7V Li-ion Replacement Battery (SNN5681)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 750mAh lithium-ion cell built to the SNN5681 specification. It fits the Motorola MPX200 smartphone. It restores power to a phone that no longer holds a charge or fails to turn on.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMPX200 platform fit:\u003c\/strong\u003e\n    The MPX200 uses a single-cell 3.7V Li-ion pack with a specific connector pinout and BMS communication line. This cell matches that pinout and voltage rail, so the phone's charge IC recognises it without throwing a charge fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the MPX200 platform. The BMS accepted the cell on first connection, charge termination triggered correctly at 4.2V, and the low-voltage cutoff engaged without locking the board.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installing this cell, disable any fast-charge mode for the first full discharge-charge cycle. This gives the MPX200's fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MPX200 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe MPX200's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the new cell's actual voltage-to-capacity relationship. The phone reads voltage and translates it to a percentage using the old map, so the number on screen drifts. One full discharge down to auto-shutoff, followed by a full uninterrupted charge to 100%, forces the IC to rewrite its reference curve against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the MPX200\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under load — modem transmit bursts and screen backlight draw current simultaneously, and a weakened or miscalibrated cell cannot hold voltage above the BMS cutoff threshold. The phone shuts off even though the reported percentage looks safe. The fuel gauge is reading average resting voltage, not the sag under peak load. Run one full calibration cycle first; if shutdowns continue, check that the cell contact tabs are fully seated — a loose connection raises internal resistance and worsens voltage sag under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409505091674,"sku":"BWCS-MPX200SL-1","price":23.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43409505124442,"sku":"BWCS-MPX200SL-2","price":27.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43409505157210,"sku":"BWCS-MPX200SL-3","price":29.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MPX200SL-big.webp?v=1779579871","url":"https:\/\/batteryweb.com\/products\/motorola-mpx200-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}